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China Suppliers Factory for GB/T 5310 Seamless Steel Tubes for High-Pressure Boilers
Ordering Information
Buyers must specify the following in orders:
- Standard number (GB/T 5310) and version/year.
- Steel grade (e.g., 20G, 15CrMoG, 12Cr1MoVG).
- Dimensions (outer diameter, wall thickness, length).
- Delivery condition (hot-rolled, cold-drawn, heat treatment status).
- Special requirements (e.g., non-destructive testing, hydrostatic pressure).
- Quantity.
Material and Manufacturing Requirements
- Steel grades: Covers carbon, alloy, and stainless steels (e.g., 20G, 12Cr2MoWVTiB).
- Manufacturing process: Tubes are produced by hot-rolling or cold-drawing, followed by heat treatment (annealing, normalizing, or tempering).
- Surface quality: Free from cracks, folds, and other defects.
Chemical Composition and Mechanical Properties
- Chemical composition: Limits for C, Si, Mn, P, S, Cr, Mo, etc., vary by steel grade.
- Mechanical properties: Tensile strength, yield strength, elongation, and hardness requirements specified for each grade.
Test Requirements
5.1 Mandatory Tests
- Hydrostatic test: Every tube must withstand specified pressure without leakage.
- Tensile test: To verify mechanical properties.
- Flattening test or bend test: For ductility evaluation (depending on tube dimensions).
- Impact test: Required for alloy steel grades (e.g., at -20°C).
5.2 Non-Destructive Testing (NDT)
- Ultrasonic testing (UT) or eddy current testing (ET): Full-length inspection for defects.
5.3 Additional Tests
- Grain size analysis (for some grades).
- High-temperature properties (if specified).
Inspection and Certification
- Batch rules: Tubes are inspected in batches (same heat number, dimensions, and heat treatment).
- Certification: Manufacturer provides a compliance certificate with test results (chemical, mechanical, NDT).
Marking & Packaging
- Marking: Includes standard number, steel grade, dimensions, manufacturer's name, and heat number.
- Packaging: Protected against corrosion (e.g., oiling, capping ends).
Key Updates in Latest Version
- Revised chemical composition limits for improved high-temperature performance.
- Enhanced NDT requirements (e.g., stricter UT criteria).
- Added new steel grades for advanced boiler applications.
Major Steel Grades & Category
9.1 Carbon Steel Grades
- 20G: The most common carbon steel grade for boiler tubes, suitable for temperatures ≤ 450°C.
- 20MnG: Higher manganese content for improved strength.
- 25MnG: Enhanced strength compared to 20MnG.
9.2 Alloy Steel Grades
9.2.1 Mo-Based Alloy Steels
- 15MoG (0.5% Mo)
- 20MoG (0.5% Mo)
9.2.2 Cr-Mo Alloy Steels (Heat-resistant for high-temperature service)
- 12CrMoG (0.5% Cr, 0.5% Mo)
- 15CrMoG (1.0% Cr, 0.5% Mo) – Widely used in power plants.
- 12Cr2MoG (2.25% Cr, 1.0% Mo, similar to ASTM A335 P22).
- 12Cr1MoVG (1.0% Cr, 0.5% Mo, V-added for creep resistance).
9.2.3 High-Cr Heat-Resistant Steels
- 12Cr2MoWVTiB (G102, T/P23): For ultra-high-temperature boilers (≤ 600°C).
- 10Cr9Mo1VNb (G91, T/P91): Advanced creep-resistant steel (≤ 650°C).
- 10Cr9MoW2VNbBN (G92, T/P92): Higher temperature resistance than G91.
- 07Cr2MoW2VNbB (G122): For supercritical boilers.
9.2.4 Stainless Steel Grades
- 07Cr19Ni10 (TP304H): Austenitic stainless steel for corrosion/heat resistance.
- 07Cr25Ni21NbN (TP310HNbN): High-temperature oxidation resistance.
9.3 Special Notes
- Suffix "G" denotes boiler tube grades (e.g., 20G vs. general 20# steel).
- Higher Cr/Mo content improves oxidation and creep resistance at elevated temperatures.
- Grades like G102, G91, and G92 are critical for advanced power plants (supercritical/ultra-supercritical boilers).
Comparison with International Standards
Some GB/T 5310 grades align with ASTM/EN standards:
- 15CrMoG ≈ ASTM A335 P12 / EN 13CrMo4-5.
- 12Cr1MoVG ≈ ASTM A335 P11.
- 10Cr9Mo1VNb (G91) ≈ ASTM A335 P91.
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Frequently Asked Questions
Q1: What is GB/T 5310 standard?
GB/T 5310 is a Chinese national standard that specifies seamless steel tubes for high-pressure boilers. It covers carbon steel, alloy steel, and stainless steel grades designed to withstand high temperatures and pressures in power generation and industrial boiler applications.
Q2: What are the most commonly used steel grades under GB/T 5310?
The most commonly used grades include 20G (carbon steel for temperatures ≤450°C), 15CrMoG (widely used in power plants), and advanced alloy grades like 10Cr9Mo1VNb (G91) for high-temperature applications up to 650°C.
Q3: What testing is required for GB/T 5310 tubes?
Mandatory tests include hydrostatic testing, tensile testing, flattening or bend tests, and impact testing for alloy grades. Non-destructive testing (ultrasonic or eddy current) is required for full-length defect inspection. Additional tests like grain size analysis may be specified.
Q4: How does GB/T 5310 compare to international standards?
Many GB/T 5310 grades have equivalent international standards. For example, 15CrMoG is similar to ASTM A335 P12, 12Cr1MoVG corresponds to ASTM A335 P11, and 10Cr9Mo1VNb (G91) matches ASTM A335 P91. This allows for international compatibility in procurement and application.
Q5: What information is needed when ordering GB/T 5310 tubes?
Orders must specify the standard number and version, steel grade, dimensions (outer diameter, wall thickness, length), delivery condition (heat treatment status), any special requirements (NDT, hydrostatic testing), and quantity.
Q6: What are the key updates in the latest version of GB/T 5310?
Recent updates include revised chemical composition limits for improved high-temperature performance, enhanced non-destructive testing requirements with stricter ultrasonic testing criteria, and the addition of new steel grades specifically designed for advanced supercritical and ultra-supercritical boiler applications.